window JNI_CreateJavaVM启动java程序

时间：2024-04-08 22:33:44

https://blog.csdn.net/earbao/article/details/51889605

  1. #define _CRT_SECURE_NO_WARNINGS 1
  3. #include <stdio.h>
  4. #include "jni.h"
  5. #include <stdlib.h>
  6. #include <windows.h>
  7. #include <tchar.h>
  10. //#pragma comment(lib, "jvm.lib")
  12. #define PATH_SEPARATOR ';' /* define it to be ':' on Solaris */
  14. #define USER_CLASSPATH "." /* where Prog.class is */
  16. void testEnv()
  17. {
  18. #ifdef _WIN32
  20. CHAR dir[1024],path[1024];
  21. GetCurrentDirectoryA(MAX_PATH, dir);
  23. sprintf(path, "set PATH=%s\\jre\\bin\\client;.;", dir);
  24. system(path);
  25. printf("%s\n", path);
  28. /**
  29. //set PATH=%PATH%;%currentdir%\jre\bin\client;
  30. TCHAR dir[1024];
  31. GetCurrentDirectoryA(MAX_PATH, dir);
  33. CHAR p[1024], path[1024];
  34. GetEnvironmentVariableA("PATH", p, 1024);
  35. sprintf("PATH = %s\n", p);
  37. sprintf(path, "%s;%s\\jre\\bin\\client", p, dir);
  38. system(path);
  39. printf("%s\n", path);
  41. GetEnvironmentVariableA("PATH", path, 1024);
  42. printf("PATH = %s\n", path);
  43. */
  46. #else
  47. char * p;
  48. if ((p = getenv("USER")))
  49. printf("USER = %s\n", p);
  51. setenv("USER", "test", 1);
  52. printf("USER = %s\n", getenv("USER"));
  54. unsetenv("USER");
  55. printf("USER = %s\n", getenv("USER"));
  59. #endif // __WIN32
  63. }
  66. //window JNI_CreateJavaVM启动java程序
  67. int main(int argc, char* argv[])
  68. {
  69. JNIEnv *env;
  70. JavaVM *jvm;
  71. jint res;
  72. jclass cls;
  73. jmethodID mid;
  74. jstring jstr;
  75. jclass stringClass;
  76. jobjectArray args;
  78. testEnv();
  79. CHAR dir[1024], path[1024];
  80. GetCurrentDirectoryA(MAX_PATH, dir);
  81. sprintf(path, "%s\\jre\\bin\\client\\jvm.dll", dir);
  83. typedef jint (*JNI_CreateJavaVMT)(JavaVM **pvm, void **penv, void *args);
  84. JNI_CreateJavaVMT pJNI_CreateJavaVM = (JNI_CreateJavaVMT)GetProcAddress(LoadLibraryA(path), "JNI_CreateJavaVM");
  85. if (pJNI_CreateJavaVM == NULL)
  86. {
  87. printf("pJNI_CreateJavaVM == NULL\n");
  88. }
  89. else
  90. {
  91. printf("pJNI_CreateJavaVM != NULL\n");
  93. }
  96. #ifdef JNI_VERSION_1_2
  98. JavaVMInitArgs vm_args;
  99. JavaVMOption options[1];
  100. options[0].optionString ="-Djava.class.path=.";
  101. vm_args.version = 0x00010002;
  102. vm_args.options = options;
  103. vm_args.nOptions = 1;
  104. vm_args.ignoreUnrecognized = JNI_TRUE;
  105. /* Create the Java VM */
  106. res = pJNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
  107. #else
  108. JDK1_1InitArgs vm_args;
  109. char classpath[1024];
  110. vm_args.version = 0x00010001;
  111. JNI_GetDefaultJavaVMInitArgs(&vm_args);
  112. /* Append USER_CLASSPATH to the default system class path */
  113. sprintf(classpath, "%s%c%s",
  114. vm_args.classpath, PATH_SEPARATOR, USER_CLASSPATH);
  115. vm_args.classpath = classpath;
  116. /* Create the Java VM */
  117. res = JNI_CreateJavaVM(&jvm, &env, &vm_args);
  118. #endif /* JNI_VERSION_1_2 */
  119. if (res < 0) {
  120. fprintf(stderr, "Can't create Java VM\n");
  121. exit(1);
  122. }
  123. cls = (*env)->FindClass(env, "Prog");
  124. if (cls == NULL) {
  125. goto destroy;
  126. }
  127. mid = (*env)->GetStaticMethodID(env, cls, "main","([Ljava/lang/String;)V");
  128. if (mid == NULL) {
  129. goto destroy;
  130. }
  132. jstr = (*env)->NewStringUTF(env, " from C!");
  133. if (jstr == NULL) {
  134. goto destroy;
  136. }
  137. stringClass = (*env)->FindClass(env, "java/lang/String");
  138. args = (*env)->NewObjectArray(env, 1, stringClass, jstr);
  139. if (args == NULL) {
  141. goto destroy;
  143. }
  144. (*env)->CallStaticVoidMethod(env, cls, mid, args);
  145. destroy:
  147. if ((*env)->ExceptionOccurred(env)) {
  149. (*env)->ExceptionDescribe(env);
  151. }
  153. (*jvm)->DestroyJavaVM(jvm);
  155. }
  1. import java.io.IOException;
  3. public class Prog {
  5. public static void main(String[] args) throws IOException {
  6. //System.out.println(args.length);
  7. if(args.length>0)
  8. {
  9. System.out.println("Hello World " + args[0]);
  11. }else{
  12. System.out.println("Hello World ");
  14. }
  15. System.in.read();
  16. }
  18. }

exe通过jni调用Java程序

  1. #define _CRT_SECURE_NO_WARNINGS 1
  3. #include <stdio.h>
  4. #include "jni.h"
  5. #include <stdlib.h>
  6. #include <windows.h>
  7. #include <tchar.h>
  9. //#pragma comment(lib, "jvm.lib")
  11. #define PATH_SEPARATOR ';' /* define it to be ':' on Solaris */
  12. #define USER_CLASSPATH "." /* where Prog.class is */
  14. void testEnv()
  15. {
  17. CHAR dir[1024], path[1024];
  18. GetCurrentDirectoryA(MAX_PATH, dir);
  19. sprintf(path, "set PATH=%s\\jre\\bin\\client;.;", dir);
  20. system(path);
  21. printf("%s\n", path);
  22. sprintf(path, "set PATH=%s\\jre\\bin\\server;.;", dir);
  23. system(path);
  24. printf("%s\n", path);
  25. }
  28. //window JNI_CreateJavaVM启动java程序
  29. int main(int argc, char* argv[])
  30. {
  31. JNIEnv *env;
  32. JavaVM *jvm;
  33. jint res;
  34. jclass cls;
  35. jmethodID mid;
  36. jstring jstr;
  37. jclass stringClass;
  38. jobjectArray args;
  40. //testEnv();
  41. CHAR dir[1024], path[1024];
  42. GetCurrentDirectoryA(MAX_PATH, dir);
  43. //注意exe的位数64bit/32bit要和jdk的相匹配
  44. HMODULE handle = NULL;
  45. if (argc > 1)
  46. {
  47. sprintf(path, "%s", argv[1]);
  48. printf("%s\n", path);
  49. handle=LoadLibraryA(path);
  50. }
  51. if (handle == NULL)
  52. {
  53. sprintf(path, "%s\\jre\\bin\\client\\jvm.dll", dir);
  54. printf("%s\n", path);
  55. handle = LoadLibraryA(path);
  56. }
  57. if (handle == NULL)
  58. {
  59. sprintf(path, "%s\\jre\\bin\\server\\jvm.dll", dir);
  60. printf("%s\n", path);
  61. handle = LoadLibraryA(path);
  62. }
  63. if (handle == NULL)
  64. {
  65. handle = LoadLibraryA("jvm.dll");
  66. }
  67. if (handle == NULL)
  68. {
  69. printf("handle==NULL\n");
  70. return -1;
  71. }
  73. typedef jint(*JNI_CreateJavaVMT)(JavaVM **pvm, void **penv, void *args);
  74. JNI_CreateJavaVMT pJNI_CreateJavaVM = (JNI_CreateJavaVMT)GetProcAddress(handle, "JNI_CreateJavaVM");
  75. if (pJNI_CreateJavaVM == NULL)
  76. {
  77. printf("pJNI_CreateJavaVM == NULL\n");
  78. }
  79. else
  80. {
  81. printf("pJNI_CreateJavaVM != NULL\n");
  83. }
  84. //初始化jvm参数 http://blog.csdn.net/louka/article/details/7101562
  85. JavaVMInitArgs vm_args;
  86. JavaVMOption options[2];
  87. //搜索的类路径。把java类和jar包放在当前目录下
  88. #if _WIN32
  89. options[0].optionString = "-Djava.class.path=.;test.jar"; //这里指定了要使用的第三方Jar包
  90. #else
  91. options[0].optionString = "-Djava.class.path=.:test.jar"; //这里指定了要使用的第三方Jar包
  92. #endif
  94. options[1].optionString = "-verbose:NONE"; //用于跟踪运行时的信息
  96. vm_args.version = 0x00010002;
  97. vm_args.options = options;
  98. vm_args.nOptions = 1;
  99. vm_args.ignoreUnrecognized = JNI_TRUE;
  100. /* Create the Java VM */
  101. res = pJNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
  103. if (res < 0) {
  104. fprintf(stderr, "Can't create Java VM\n");
  105. exit(1);
  106. }
  107. cls = (*env)->FindClass(env, "Prog");
  108. if (cls == NULL) {
  109. goto destroy;
  110. }
  111. mid = (*env)->GetStaticMethodID(env, cls, "main", "([Ljava/lang/String;)V");
  112. if (mid == NULL) {
  113. goto destroy;
  114. }
  116. jstr = (*env)->NewStringUTF(env, " from C!");
  117. if (jstr == NULL) {
  118. goto destroy;
  120. }
  121. stringClass = (*env)->FindClass(env, "java/lang/String");
  122. args = (*env)->NewObjectArray(env, 1, stringClass, jstr);
  123. if (args == NULL) {
  124. goto destroy;
  125. }
  126. (*env)->CallStaticVoidMethod(env, cls, mid, args);
  127. (*env)->DeleteLocalRef(env, cls);
  128. (*env)->DeleteLocalRef(env, jstr);
  129. (*env)->DeleteLocalRef(env, stringClass);
  130. (*env)->DeleteLocalRef(env, args);
  132. destroy:
  133. if ((*env)->ExceptionOccurred(env)) {
  134. (*env)->ExceptionDescribe(env);
  135. }
  136. (*jvm)->DestroyJavaVM(jvm);
  137. FreeLibrary(handle);
  138. }

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window JNI_CreateJavaVM启动java程序

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